The world's first ethanol billionaire saw his fortune drop by half since 2007 amid the decline of sugar and ethanol prices and takeover rumors. With family, Ometto controls Cosan S.A., one of the world's largest growers and processors of sugarcane, and one of the largest producers of ethanol. Cosan listed its shares on Brazilian stock exchange in 2005. The company's origins date from 1936, when the Ometto family established a sugarcane mill. Cosan has grown since 2000 through acquisitions and new partnerships. Currently undergoing a restructuring aimed at turning Cosan into a global company.